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1 When the burner of a stovetop is very hot, it is a source of heat energy. 2  Anything placed onto the stovetop and warmed, whether a pot of tea or a skillet for frying eggs, also become sources of heat energy. 3  Automobile fuels such as gasoline are sources of heat energy, as is the hot engine of a racecar or a school bus.
The heat from this cup of hot water produces steam. noun. The definition of heat is a form of energy that causes a difference in temperature, or the perception of warmth. An example of heat is hot water. Heat is defined as to add warmth to something. An example of heat is bringing a kettle of water to a boil.